Fluorescent pigment powder gives you neon colour that looks bright in daylight and lights up vividly under a UV blacklight. It is one of the easiest ways to make blacklight art, party decorations and UV effects - as long as you know how it behaves.
This guide covers what fluorescent pigment is, which mediums it works in, how much to add, and how to get the strongest neon effect.
What Is Fluorescent Pigment Powder?
Fluorescent (UV-reactive) pigment absorbs invisible ultraviolet light and gives it back as bright visible colour. That is why it looks so intense under a blacklight - and even in daylight, which contains some UV, the colours look extra vivid.
The important thing to know: fluorescent pigment does not glow in the dark. It only glows while UV light is shining on it. Switch the UV light off and the glow stops instantly. If you want a glow that keeps going after the lights go out, you need glow in the dark (phosphorescent) pigment instead. Our fluorescence vs phosphorescence guide explains the difference in detail.
What Can You Mix Fluorescent Powder Into?
Fluorescent pigment does not dissolve - it mixes into a binder that holds it on your surface. It works best in clear or white mediums:
- Clear acrylic medium or gel - the easiest way to make your own neon UV paint. A clear acrylic medium keeps the colour pure.
- White acrylic paint - gives a pastel neon look and good coverage.
- Epoxy resin - for neon resin art, coasters and jewellery. Resin needs much less pigment; see our fluorescent resin guide.
- Clear varnishes and coatings - for a UV-reactive top layer on finished pieces.
- Polymer clay and plaster - knead or stir it in for neon sculptures. The powder is heat resistant up to 200 °C, which covers normal clay baking temperatures.
Always test a small amount in your medium first, as every product behaves a little differently.
How Much Fluorescent Pigment to Add
- Paint and acrylic mediums: start with 20–30% pigment and 70–80% medium by weight of the total mix (for example 25 g pigment + 75 g medium). More pigment gives stronger, more opaque colour.
- Resin: start much lower - around 2–5% by weight - because the ultra-fine powder colours resin very strongly, and too much can affect curing.
- Coatings and varnish: start low and add more until you get the strength you want.
Because the particles are only 2–5 µm, the powder mixes smoothly with no gritty texture. Add it gradually and stir well to break up any small clumps.
How to Make Neon UV Paint - Step by Step
- Weigh your clear acrylic medium into a mixing cup.
- Weigh the pigment so it makes up 20–30% of the total mix - for example 25 g pigment for 75 g medium.
- Add the powder little by little while stirring.
- Stir for 1–2 minutes until the colour is even and smooth.
- Paint a test swatch and check it under your UV light before starting your piece.
How to Get the Brightest Neon Effect
Paint over white
Fluorescent colours are at their brightest over a white surface. A layer of white gesso or white paint underneath usually makes colours look more vivid than painting straight onto a dark or coloured surface.
Use the right UV light
Fluorescent pigment reacts best to UV light between 365 and 395 nm. A 395nm UV flashlight works well for art and photos. Make the room as dark as possible - other light washes out the neon effect.
Choose the right colour
Colours react differently under UV, so check a swatch of each one under your own light before planning a piece. Warm colours such as Yellow are a good place to start.
Build in layers - with the blacklight on
Two thin coats give a more even, stronger colour than one thick coat. Try painting with your UV light switched on: thin or missed areas show up immediately, so you can fix them as you go.
Watch out for blues and purples
Many LED blacklights give off a visible purple light. Blue and purple fluorescent colours sit close to that colour, so they can look weak or blend into the purple haze. Moving the light closer, using a stronger light, or placing blues next to contrasting colours like orange and yellow helps them stand out.
Things to Know Before You Start
- Fluorescent colours fade in strong sunlight. Keep finished pieces out of direct sun when possible - even a very sunny room can fade them over time.
- UV-blocking varnish stops the effect. A varnish that blocks UV protects against fading, but it also stops the UV light from reaching the pigment. Choose one goal: maximum UV glow, or maximum fade protection.
- It is not for skin, nails or cosmetics. This pigment is for art, craft and DIY use only.
- Avoid breathing in the powder. It is very fine, so open bags gently and wear a dust mask when handling larger amounts.
Combine Fluorescent and Glow in the Dark
Want a piece that looks neon under blacklight and still glows when the lights go off? Paint the glow in the dark layer first, then add fluorescent details on top or next to it. Keep fluorescent layers thin over glow areas, because an opaque layer will dim the glow underneath. Test your combination before a big project.
Frequently Asked Questions
Does fluorescent pigment glow in the dark? No. It glows only while UV light is shining on it. For a glow that lasts after the lights go off, use glow in the dark pigment.
What light do I need for fluorescent pigment? A UV blacklight between 365 and 395 nm. A 395nm UV flashlight is a simple, affordable option.
How much fluorescent powder do I add to paint? Start with 20–30% pigment and 70–80% clear medium by weight, then adjust for the strength you want.
Can I mix fluorescent powder into regular acrylic paint? Yes, but it works best in clear medium or white paint. Dark or strongly coloured paints hide the neon effect.
Why do my blue fluorescent colours look dull? Many LED blacklights give off visible purple light, which makes blues and purples harder to see. Move the light closer, use a stronger light, or pair blues with contrasting warm colours.
Is fluorescent pigment heat resistant? Our fluorescent powders are heat resistant up to 200 °C.
Shop Fluorescent Pigments
Our fluorescent UV pigment powders come in 13 neon colours, from 5 g samples to 1 kg, all ultra-fine at 2–5 µm.
Written by the GlowThatWows team - specialists in glow in the dark and fluorescent pigments.
